linux-kernel - [PATCH] firmware: dmi-id: add a release callback function

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Message-Id: <20240213100238.456912-1-arnd@kernel.org>
Date: Tue, 13 Feb 2024 11:02:17 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: Jean Delvare <jdelvare@...e.com>
Cc: Arnd Bergmann <arnd@...db.de>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev
Subject: [PATCH] firmware: dmi-id: add a release callback function

From: Arnd Bergmann <arnd@...db.de>

dmi_class uses kfree() as the .release function, but that now causes
a warning with clang-16 as it violates control flow integrity (KCFI)
rules:

drivers/firmware/dmi-id.c:174:17: error: cast from 'void (*)(const void *)' to 'void (*)(struct device *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict]
  174 |         .dev_release = (void(*)(struct device *)) kfree,

Add an explicit function to call kfree() instead.

Fixes: 4f5c791a850e ("DMI-based module autoloading")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/firmware/dmi-id.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/dmi-id.c b/drivers/firmware/dmi-id.c
index 5f3a3e913d28..d19c78a78ae3 100644
--- a/drivers/firmware/dmi-id.c
+++ b/drivers/firmware/dmi-id.c
@@ -169,9 +169,14 @@ static int dmi_dev_uevent(const struct device *dev, struct kobj_uevent_env *env)
 	return 0;
 }
 
+static void dmi_dev_release(struct device *dev)
+{
+	kfree(dev);
+}
+
 static struct class dmi_class = {
 	.name = "dmi",
-	.dev_release = (void(*)(struct device *)) kfree,
+	.dev_release = dmi_dev_release,
 	.dev_uevent = dmi_dev_uevent,
 };
 
-- 
2.39.2